39722 - inconsisent event handling with null HREF in A tag

Status: VERIFIED FIXED

(Core :: DOM: Core & HTML, defect, P3)

Description

[rvj]

if an A tag is defined with a null reference and the onmouseclick is set 
to 'return false' the click is ignored. If however an onmouseover event is also 
defined with or without 'return false', the browser will navigate to the parent 
directory. The null reference is required for backwards compatibility.

The following works correctly - the click event is ignored

<A href=""  onclick="return false" ><IMG src="image.gif" ></A> 

However the following incorrectly navigates to the parent directory.

<A href=""  onclick="return false" onmouseover="return false"><IMG 
src="image.gif" ></A>

Comment 1

[Sean Richardson]

Passing to the "DOM Level 0" component, responsible for onclick and other
4.x-compatible js.

[e-mail], a small testcase using that code would be useful. You can
use the "URL" field, or use the _Create a new attachment_ link and upload
a testcase file to bugzilla.

Comment 2

[Johnny Stenback (:jst)]

Tom, could you have a look at this?

Comment 3

[David Baron :dbaron: (⌚️UTC-5, no longer working on Mozilla)]

Attachment: simple testcase (as given by reporter)

Comment 4

[David Baron :dbaron: (⌚️UTC-5, no longer working on Mozilla)]

Marking confirmed.  In 4.x, neither image is clickable, but in Mozilla the lower
one is.

Comment 5

[joki (gone)]

This is a dupe of a previous bug that was fixed a couple of weeks ago.  I'm just 
going to mark this fixed rather than spend time finding the old one.

Comment 6

[Prashant Desale]

Verified with 2000-07-07-10.